Bug#919262: Fail to upgrade with Failed to restart ssh.service: Unit -.mount is masked.

[Colin Watson <cjwatson@debian.org>]

On Mon, Jan 14, 2019 at 09:36:20AM +0100, Christian Marillat wrote:
> Setting up openssh-server (1:7.9p1-5) ...
> rescue-ssh.target is a disabled or a static unit, not starting it.
> Failed to restart ssh.service: Unit -.mount is masked.
> invoke-rc.d: initscript ssh, action "restart" failed.

This is pretty opaque to me, and the logs don't provide much of a clue.
CCing the systemd maintainers - do you have any idea what's going on
here?

Thanks,

-- 
Colin Watson                                       [cjwatson@debian.org]